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Pharkidonotus megalius
Discussion
Pharkidonotus aff. westi Kues & Batten 2001 p. 13 - 14 f. 3.23 probably belongs here.
Taxonomy
Pharkidonotus megalius was named by Kues (1987). Its type specimen is UNM 9375, a shell, and it is a 3D body fossil. Its type locality is Unnamed Arroyo slope, south end of Mud Springs Mountains, which is in a Desmoinesian marine shale in New Mexico.
Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Pharkidonotus megalius Kues 1987
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. S. Kues 1987 | An extraordinarily large, cryptomphalous species of Pharkidonotus that attains a length of at least 90 mm, possesses a prominent, raised, broadly rounded median ridge that supports a narrow selenizone, and displays subdued to obscure collabral undulations across the upper whorl surface.
Shell extremely large for genus, cryptomphalous, nongeniculate; body whorl broad, expanding anteriorly to produce a reniform aperture; maximum shell width at anterior about equal to shell length; shell height about two-thirds of shell length; anterior lips thin, gently convex; lateral lips thick, straight to very gently convex, meeting umbilical area with slight deflection; umbilicus deep, circular, of moderate size, covered by lateral lips; parietal inductura on early part of body whorl forming a conspicuous pad extending posteriorly slightly past plane of aperture and thickening laterally to merge with underside of lateral lips; shell surface in transverse view strongly arched at median ridge, sloping gently away from ridge, then descending steeply to umbilical region; median ridge prominent, high, broadly rounded, expanding considerably in width anteriorly and on some specimens paralleled on both sides of its base by a shallow, linear depression; selenizone inconspicuous, narrow, flat to gently convex, unornamented, situated on summit of median ridge; slit not observed in anterior lips but apparently narrow and moderately deep (7 mm), judging from growth traces of the slit visible within the selenizone of a few acid-etched shells; growth lines curving gently forward across dorsal surface of body whorl, then bending posteriorly across median ridge; shell surface nearly smooth towards anterior, with earlier portions of the body whorl displaying very low, faint collabral undulations; shell thickness extreme (up to 15 mm) near intersection of lateral lips with umbilical region, thinning considerably medially across dorsal shell surface (to no more than 2 mm) before increasing at median ridge. |